Conjure (a.k.a. Summon) causes the requested creature to appear and fight by your side. A different magical effect is used for each different creature that can be conjured.

When you cast a Conjure spell, the creature will appear at the location where you are currently aiming. If you are aiming at a point that is too far away from you, the crosshairs on your screen will turn red, indicating that it is impossible to cast the conjure spell in that direction; you will need to point towards a closer location before releasing the cast button.

Unless you have unlocked the Twin Souls perk, only one creature or NPC can be conjured or reanimated at a time. Conjuring a second will cause the first to vanish. Twin Souls allows two conjured or reanimated at once.

On occasion, a summoned creature will remain in place for a long time after it should have vanished. It will remain near where it was summoned and attack people nearby (even the player if they return to the area), this is caused by the player changing cells or fast travelling before the summoned creature has properly spawned.